Numerical approach for modelling cavitating flows.

摘要

The flow about a submerged partially- or supercavitating axisymmetric body is considered in this paper both at zero and non-zero angle of attack. The direct boundary element method is used to solve for the potential flow field and to determine the cavity shape. This is accomplished by performing a Newton-Raphson iteration in which the cavity shape is perturbed in an effort to satisfy the nonlinear dynamic boundary condition along the surface of the cavity. For problems with non-zero angle of attack, the flow field is three-dimensional and the cavity is not symmetric. In these cases, the convergence of the Newton-Raphson iteration is sensitive to the initial estimate of the cavity shape. Methods of generating these initial estimates are discussed which have been successful in leading to convergent solutions. Also efficient methods of parameterizing the cavity are developed to reduce the computational effort. 24 refs., 8 figs.